Install PHP 7.1 with the ondrej/php PPA

sudo add-apt-repository ppa:ondrej/php

sudo apt-get update

sudo apt-get install php7.1

sudo apt-get install php7.1-cli \
php7.1-common  \
php7.1-json  \
php7.1-opcache  \
php7.1-mysql  \
php7.1-mbstring  \
php7.1-mcrypt  \
php7.1-zip php7.1-fpm

sudo a2dismod php7.2

sudo a2enmod php7.1

sudo service apache2 restart
Puis configurer la version active
sudo update-alternatives --set php /usr/bin/php7.
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sudo add-apt-repository ppa:ondrej/php

sudo apt-get update

sudo apt-get install php7.1

sudo apt-get install php7.1-cli \
php7.1-common  \
php7.1-json  \
php7.1-opcache  \
php7.1-mysql  \
php7.1-mbstring  \
php7.1-mcrypt  \
php7.1-zip php7.1-fpm

sudo a2dismod php7.2

sudo a2enmod php7.1

sudo service apache2 restart
Puis configurer la version active
sudo update-alternatives --set php /usr/bin/php7.
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Compatibility context
This procedure documents a PHP or Apache environment from its time. PHP 5.x and 7.x branches no longer receive standard support from the PHP project: do not deploy this configuration as is on a new server.

First identify the versions actually installed and the loaded modules.
Prepare a configuration backup and a rollback procedure.
Validate the syntax, then the critical paths, on a version of PHP that is still maintained.

Reference: currently supported PHP versions.